package cn.tedu._03vehicle.base.filters;

import cn.tedu._03vehicle.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * WebFilter注解: 配置拦截器的名称和需要拦截的请求的路径Path.
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = {"/v1/vehicle/*"})
public class LoginCheckFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //登录状态校验的过滤器
        log.debug("正在使用过滤器进行登录状态的校验");
        //HttpServletRequest类是ServletRequest的一个子类;
        //此处需要用到子类的方法,所以需要进行类型转换;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取会话
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO != null){//登录状态无问题,放行!!!
            //放行!!!
            //有此行代码,代表放行;无此行代码,代表不允许执行请求的资源;
            filterChain.doFilter(request, response);
        }else {
            //重定向到登录页面
            response.sendRedirect("/login.html");
        }
    }

    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}
